"Nothing sharpens sight like envy."
17th century British clergy/author
Depending on Mr. Fuller's definition of "sight" . . . maybe.
Yes if the implication is that the envious are, as a result of being envious, more determined to achieve whatever it is they are envious of.
However more often I find that envy leads to too much focus on the accomplishment of others, rather than concentrating on achieving one's own goals.
What about you?